Maximum drawdown — what does it mean for your account?

An account grows from 10,000 to 11,500 euros, then slides to 8,700 euros over three weeks. Measured from the peak, that is a 24 percent drawdown — and this is exactly the moment when most beginners abandon a method that has not stopped working at all. Drawdown is the one number that tells you whether a strategy is survivable on a real account. Below we explain how to compute it, why recovering a loss is asymmetric, and where the thresholds lie at which people give up.

What exactly does drawdown mean?

Drawdown is the fall from a peak in account equity to its current value, expressed as a percentage of that peak. The formula is short:

drawdown = (peak − current equity) ÷ peak × 100%

Take a concrete case. The account starts at 10,000 USD. After two weeks equity reaches 11,500 USD — a new peak. A losing streak then drags it down to 9,800 USD, so the drawdown is (11,500 − 9,800) ÷ 11,500, or 14.8 percent. When the trough deepens to 8,700 USD, the drawdown grows to 24.3 percent.

The easiest thing to get wrong: drawdown is always measured from the peak, never from the amount you deposited. If the account has grown to 20,000 USD and then falls to 15,000, the drawdown is 25 percent — even though you are still 50 percent above your original deposit.

What is maximum drawdown and why bother measuring it?

Maximum drawdown (MDD for short) is the deepest drawdown recorded in the period under review. If over twelve months the account suffered four slides from successive peaks — 8, 14, 23 and 11 percent — the maximum drawdown is 23 percent. Not the average of those four numbers, but the single worst episode. People confuse the two surprisingly often; average drawdown is a separate measure and usually a far gentler one.

That single number tells you three things at once. First, how much pain the strategy demands of you — the question "will I still trade the same way after a 23 percent fall?" is practical, not rhetorical. Second, the scale of ruin risk: if the account history already shows 30 percent, a 50 percent scenario stops being theoretical. Third, the quality of the method itself. Two strategies with the same annual result of plus 20 percent, but maximum drawdowns of 5 and 35 percent, are two entirely different propositions for the same person.

Why is recovering a loss asymmetric?

The most merciless property of drawdown: getting back to where you started requires a larger percentage gain than the fall itself. That is arithmetic, not a matter of opinion — after a loss you are counting percentages off a smaller base.

The formula: required gain = 1 ÷ (1 − drawdown) − 1. A 50 percent drawdown takes 100 percent to recover; an 80 percent drawdown already takes 400 percent.

Translate that into time, because time is how you actually experience it. A strategy earning 15 percent a year that has fallen into a 50 percent drawdown has to double the account to return to its old peak. At that pace it means close to five years of trading purely to recover — five years of work after which you are back where you began. Hence the rule I have been repeating to readers for years: protecting capital is cheaper than recovering it.

"I'm always thinking about losing money as opposed to making money." — Paul Tudor Jones, quoted in Jack D. Schwager, Market Wizards, New York Institute of Finance, 1989.

Where are the thresholds at which traders give up?

The thresholds below do not come from a randomised study with a confidence interval. They are the picture that has formed for me over more than a decade of reading trading journals and reader correspondence — an orientation map, not a statistic.

The practical conclusion is simple: a strategy meant for an individual trader should keep its maximum drawdown below 20 percent. Not because the mathematics demands it — 30 percent can also be recovered. It is because the deeper the drawdown, the greater the chance you abandon the method before it has had time to show whether it has any edge at all.

What to do tomorrow so drawdown does not push you out of the market

1. Compute your drawdown at the end of every week, not every month. A spreadsheet with three columns is enough: the date, equity at Friday's close, and the highest equity in the account's history. The third column gives you the drawdown in a single formula. A monthly rhythm is too slow — in four weeks you can deepen a slide considerably before you even notice it.
2. Cut position size in half once you pass 10 percent. If you risk 1 percent of capital per trade, drop to 0.5 percent and keep trading the same method, only slower. If you hold several correlated positions, an alternative is partially offsetting the exposure, which limits the further slide without closing everything outright.
3. Take a week away from trading once you pass 20 percent. Spend that week on your journal: list every losing trade from the past month and mark against each one whether the failure was in the strategy, the execution or the emotions. Three categories, nothing more. If the third one dominates, the method is not the problem and changing the method will fix nothing.
4. Go back to a demo account once you pass 30 percent. Not for a month as a matter of principle, but until you have reproduced twenty demo trades that follow your plan on entry rules, position size and exit. Live trading in a drawdown that deep usually ends in an attempt to win it back quickly — which is exactly what deepened it in the first place.
5. Write down your exit threshold before you need it. Funds managing other people's money have drawdown limits in their mandate and do not renegotiate them halfway through a slide. You can impose the same on yourself — one sentence in your trading plan, with a date and a signature. Slides triggered by black-swan events, where price jumps straight through the stop-loss, remain a separate risk category in which no limit behaves as planned.